On January 21, 2026, from approximately 14:00 to 15:26 UTC, some users experienced increased error rates and slower response times when using Claude Sonnet 4.5 through our API. The issue was caused by insufficient compute capacity allocated to meet demand, and was resolved by our team scaling up additional serving resources. We apologise for the disruption and will implement monitoring improvements to detect capacity constraints earlier.
Posted Jan 21, 2026 - 15:58 UTC
Resolved
This incident has been resolved.
Posted Jan 21, 2026 - 15:32 UTC
Monitoring
A fix has been implemented and we are monitoring the results.
Posted Jan 21, 2026 - 15:28 UTC
Identified
The issue has been identified and a fix is being implemented.
Posted Jan 21, 2026 - 15:01 UTC
Investigating
We are currently investigating this issue.
Posted Jan 21, 2026 - 14:44 UTC
This incident affected: claude.ai, platform.claude.com (formerly console.anthropic.com), Claude API (api.anthropic.com), and Claude Code.